Your Friend has raised red flags in his thinking outside of the organisational line.
Naturally the Elder body will become concerned that his thinking is not being spread to others.
The first visit wil be to qualify his actualy thinking, and his reasons for stating such to the elders directly and make sure that in the face of two witrnesses they have his concepts correct or not.
If they understand him correctly and there IS a problem in his attitude as there seems to be so from your comments, the second visit with three elders with be conducted as a re confirmation of his current thinking again, and then an attempted readjustment of that thinking appealing to his reasoning to change that thinking.
firstly he should let them in and after useless banter / chit chat,,,,
respectfully Ask them DIRECTLY what it is they have come for, then Listen carefully to what they say.
At that point they will be wanting to hear from him if he is not towing the company line or he agrees with them.
Where by they will try to show him scriptures to adjust his thinking or see if he is apostateor end it nicely with coffee and cake.....
Your friend has three options only during the meeting:
1/ Meekly submit to their reasoning and agree fully with everything that they say. (If he does that they cannot do anything)
2/ Tell them his reasoning and show them scriptual proof, if it is within WTBS policy and he can quote WT articules as to such then he should do so at this time. if he canot do so he should take option no1 if he wishes to stay in the congregation.
3/ (if he don't want to stay in the wtbs) thentell them his reasoning as an apostate and ask them to leave his house immediately ( this will end the meeting and a JC wil be held to kick his butt out of the congregation so as to stop his thoughts being shared to others)
crying, begging or pleading dosent do anything to help his case.